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Subject :IMO    Class : Class 7

Find the measure of the angle x in the given figure.

A 50°
B 70°
C 60°
D 30°

The answer is C and not B because :Angle EDF=180-42-28=120 Now , Sum of Angle GDF and EDF is 180. We know Angle EDF is 120 , so Angle GDF is 180-120=60 !

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